controller.json

{
  "@context": [
    "https://w3id.org/security/v2"
  ],
  "id": "https://gist.github.com/bcyrill/4340c721a899ee6303259f1701936d39/raw",
  "assertionMethod": [{
    "id": "https://gist.githubusercontent.com/bcyrill/b94605fc7983274cc0379988730ad986/raw",
    "type": "Ed25519VerificationKey2018",
    "controller": "did:example:123",
    "publicKeyBase58": "BYEz8kVpPqSt5T7DeGoPVUrcTZcDeX5jGkGhUQBWmoBg"
  },
  "did:example:123#WjKgJV7VRw3hmgU6--4v15c0Aewbcvat1BsRFTIqa5Q"
  ]
}